CN109343606B - Separation compensation temperature control device - Google Patents
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- CN109343606B CN109343606B CN201811360418.8A CN201811360418A CN109343606B CN 109343606 B CN109343606 B CN 109343606B CN 201811360418 A CN201811360418 A CN 201811360418A CN 109343606 B CN109343606 B CN 109343606B
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- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
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- G05D23/19—Control of temperature characterised by the use of electric means
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Abstract
The invention discloses a separation compensation temperature control device. The device includes temperature sensing circuit, separation drive circuit and calibration circuit, wherein: the temperature sensing circuit adopts a temperature sensor to measure the external temperature change, converts the temperature change into the voltage signal change, and adjusts the temperature compensation zero point through the subtracting circuit; the separation driving circuit is used for driving and amplifying the voltage signal output by the temperature sensing circuit, then respectively connecting two diodes with opposite directions, and outputting the separated voltage in a high-temperature state and a low-temperature state; the calibration circuit is used for adding and synthesizing the voltages in the high-temperature state and the low-temperature state, and the added and synthesized voltage is added with the adjustable voltage output by one voltage division network in the forward direction and added with the adjustable voltage output by the other voltage division network in the reverse direction; and (3) performing normal-temperature zeroing correction by adjusting the partial pressure network. The invention has the advantages of wide temperature regulation range, high temperature resolution and high-low temperature separation regulation, and has wide application prospect.
Description
Technical Field
The invention belongs to the technical field of electronic circuits, and particularly relates to a separation compensation temperature control device.
Background
Zero drift is a phenomenon commonly found in electronic circuits, and particularly for electronic components operating in a wide temperature range (-40 to +85 ℃) requires a precise zero drift temperature compensation technique. For electronic components with consistent temperature characteristics in high and low temperature areas, zero drift of the electronic components can be eliminated by a temperature sensor; however, for the case that the temperature slopes of the high temperature region and the low temperature region are inconsistent, the conventional zero drift suppression technology cannot meet the design requirements.
The separation compensation temperature control technology is a temperature compensation technology applied to eliminating zero drift of direct current signals. The main indicators describing this technology are: 1) Compensating voltage peak-to-peak value: 120mV; 2) Typical temperature slope: 15 mV/DEG C (the high and low temperatures can be respectively adjusted); 3) The compensation range is 2.5V; 4) Working temperature range: -40 to +85 ℃; 5) Dimensions (length) 25mm x (width) 15mm x (height) 5mm. The existing products of the same type have the following defects: 1) The working temperature range is small, and is generally-30 to +60 ℃; 2) The compensation range is small, generally about 1V; 3) The high temperature area and the low temperature area can only have uniform slopes, and separation compensation can not be realized for inconsistent slopes of the high temperature area and the low temperature area.
Disclosure of Invention
The invention aims to provide a separation compensation temperature control device with wide temperature range, large compensation range and small circuit size.
The technical solution for realizing the purpose of the invention is as follows: the utility model provides a separation compensation temperature control device, includes temperature sensing circuit, separation drive circuit and calibration circuit, wherein:
the temperature sensing circuit adopts a temperature sensor to measure the external temperature change, converts the temperature change into the voltage signal change, and adjusts the temperature compensation zero point through a subtraction circuit;
the separation driving circuit receives the voltage signal output by the temperature sensing circuit, drives and amplifies the voltage signal, and the amplified voltage signal is respectively connected to two diodes with opposite directions to separate and output the voltage in a high-temperature state and a low-temperature state;
the calibration circuit receives the voltages in the high-temperature state and the low-temperature state output by the separation driving circuit, and adds and synthesizes the voltages, wherein the added and synthesized voltage is added with the adjustable voltage output by one voltage division network in the forward direction and added with the adjustable voltage output by the other voltage division network in the reverse direction; and (3) performing normal-temperature zeroing correction by adjusting the partial pressure network.
As a specific example, the temperature sensing circuit includes a temperature sensor, a double pole double throw switch, a first operational amplifier, and first to sixth resistors;
the temperature sensor converts temperature information into voltage VT0 and outputs the voltage VT0, the output end is grounded through a fifth resistor and a sixth resistor in sequence, and the common end of the fifth resistor and the sixth resistor is connected to the non-inverting input end of the first operational amplifier through a double-pole double-throw switch;
the first resistor, the second resistor and the third resistor are connected to a common end, the voltage of the common end is the voltage VD, the other end of the first resistor is connected to the reference voltage VR1, the other end of the second resistor is connected to the ground GND, the other end of the third resistor is connected to the inverting input end of the first operational amplifier through a double-pole double-throw switch on one hand, and is connected to the output end of the first operational amplifier through a fourth resistor on the other hand, and the first operational amplifier outputs the voltage VT1.
As a specific example, the split driving circuit includes second to fourth operational amplifiers, first to second diodes, and seventh to twelfth resistors;
the voltage VT1 output by the temperature sensing circuit is connected to the non-inverting input end of the second operational amplifier, and the inverting input end of the second operational amplifier is grounded through a seventh resistor on one hand and connected to the output end of the second operational amplifier through an eighth resistor on the other hand; the voltage VT1S output by the second operational amplifier is respectively connected to the cathode of the first diode and the anode of the second diode, the anode of the first diode is connected to the non-inverting input end of the third operational amplifier, and the cathode of the second diode is connected to the non-inverting input end of the fourth operational amplifier; the inverting input end of the third operational amplifier is grounded through a tenth resistor on one hand, and is connected to the output end of the third operational amplifier through a ninth resistor on the other hand; the inverting input end of the fourth operational amplifier is grounded through a twelfth resistor on one hand, and is connected to the output end of the fourth operational amplifier through an eleventh resistor on the other hand; the third operational amplifier outputs a voltage VT2 in a high temperature state, and the fourth operational amplifier outputs a voltage VT3 in a low temperature state.
As a specific example, the calibration circuit includes a fifth operational amplifier, thirteenth to twenty-first resistors;
the voltage VT2 in a high temperature state and the voltage VT3 in a low temperature state output by the driving circuit are connected into the non-inverting input end of the fifth operational amplifier through a fifteenth resistor and a sixteenth resistor respectively;
the seventeenth resistor, the eighteenth resistor and the nineteenth resistor are connected to a common end, the voltage of the common end is the voltage VF2, the other end of the nineteenth resistor is grounded, the other end of the eighteenth resistor is connected with the reference voltage VR2, the other end of the seventeenth resistor is connected to the non-inverting input end of the fifth operational amplifier, and the reference voltage VR2 obtains the adjustable voltage VF2 through a voltage dividing network formed by the eighteenth resistor and the nineteenth resistor;
the thirteenth resistor, the twentieth resistor and the twenty-first resistor are connected to a common end, the voltage of the common end is the voltage VF3, the other end of the twentieth resistor is grounded, the other end of the twenty-first resistor is connected with the reference voltage VR3, the other end of the thirteenth resistor is connected to the inverting input end of the fifth operational amplifier, and the reference voltage VR3 obtains the adjustable voltage VF3 through a voltage dividing network formed by the twentieth resistor and the twenty-first resistor; the reverse input end of the fifth operational amplifier is connected with the output end through a fourteenth resistor;
and correcting and zeroing the temperature compensation voltage VT output by the fifth operational amplifier by adjusting the voltage division network to be used as a final output.
As a specific example, the temperature sensor is TMP36, the output voltage of the temperature sensor at the normal temperature of 25 ℃ is 750mV, the voltage dividing network formed by the first resistor and the second resistor divides the reference voltage VR1 of +5v to the voltage VD of 750mV, and the output voltage of the temperature sensor is subtracted from the voltage VD, so that the temperature compensation voltage is corrected to be within +/-10 mV at the normal temperature of 25 ℃, thereby realizing normal temperature correction and zero setting.
As a specific example, in the split driving circuit, when the temperature is higher than 25 ℃, the voltage VT1S is positive, and is output to the fourth operational amplifier through the second diode; when the temperature is lower than 25 ℃, the voltage VT1S is negative and is output to the third operational amplifier through the first diode; the third operational amplifier and the fourth operational amplifier respectively adjust the amplification factors, so that the voltage VT2 in the high-temperature state and the voltage VT3 in the low-temperature state which are separately output through the diode have different temperature slopes and are output to the calibration circuit.
As a specific example, in the temperature sensing circuit, the input signal of the first operational amplifier is reversely connected, that is, the output of the temperature sensor is connected to the inverting input end of the first operational amplifier, and the reference voltage VR1 is connected to the non-inverting input end of the first operational amplifier, so that the inversion of the temperature slope can be realized, and the temperature sensing circuit is used for temperature compensation of a reverse temperature drift system.
Compared with the prior art, the invention has the remarkable advantages that: (1) The temperature sensing circuit, the separation driving circuit and the calibration circuit are used for realizing the separation independent compensation of high temperature and low temperature, and the temperature slopes of the high temperature area and the low temperature area can be compensated differently; (2) the temperature compensation range is wide and reaches-40 to +85 ℃; the compensation precision is high, and the error is less than +/-2 ℃.
Drawings
FIG. 1 is a schematic diagram of a circuit structure of a separation compensation temperature control device according to the present invention.
Detailed Description
Referring to fig. 1, the separation compensation temperature control device of the present invention includes a temperature sensing circuit, a separation driving circuit, and a calibration circuit, wherein:
the temperature sensing circuit adopts a temperature sensor to measure the external temperature change, converts the temperature change into the voltage signal change, and adjusts the temperature compensation zero point through a subtraction circuit;
the separation driving circuit receives the voltage signal output by the temperature sensing circuit, drives and amplifies the voltage signal, and the amplified voltage signal is respectively connected to two diodes with opposite directions to separate and output the voltage in a high-temperature state and a low-temperature state;
the calibration circuit receives the voltages in the high-temperature state and the low-temperature state output by the separation driving circuit, and adds and synthesizes the voltages, wherein the added and synthesized voltage is added with the adjustable voltage output by one voltage division network in the forward direction and added with the adjustable voltage output by the other voltage division network in the reverse direction; and (3) performing normal-temperature zeroing correction by adjusting the partial pressure network.
As a specific example, the temperature sensing circuit includes a temperature sensor S1, a double pole double throw switch U6, a first operational amplifier U1, and first to sixth resistors R1 to R6;
the temperature sensor S1 converts temperature information into voltage VT0 and outputs the voltage VT0, the output end is grounded through a fifth resistor R5 and a sixth resistor R6 in sequence, and the common end of the fifth resistor R5 and the sixth resistor R6 is connected to the non-inverting input end of the first operational amplifier U1 through a double-pole double-throw switch U6;
the first resistor R1, the second resistor R2 and the third resistor R3 are connected to a common end, the voltage of the common end is the voltage VD, the other end of the first resistor R1 is connected with the reference voltage VR1, the other end of the second resistor R2 is connected with the ground GND, the other end of the third resistor R3 is connected to the inverting input end of the first operational amplifier U1 through the double-pole double-throw switch U6 on one hand, and is connected to the output end of the first operational amplifier U1 through the fourth resistor R4 on the other hand, and the first operational amplifier U1 outputs the voltage VT1.
As a specific example, the separate driving circuit includes second to fourth operational amplifiers U2 to U4, first to second diodes D1, D2, and seventh to twelfth resistors R7 to R12;
the voltage VT1 output by the temperature sensing circuit is connected to the non-inverting input end of the second operational amplifier U2, and the inverting input end of the second operational amplifier U2 is grounded through a seventh resistor R7 on one hand and connected to the output end of the second operational amplifier U2 through an eighth resistor R8 on the other hand; the voltage VT1S output by the second operational amplifier U2 is respectively connected to the cathode of the first diode D1 and the anode of the second diode D2, the anode of the first diode D1 is connected to the non-inverting input end of the third operational amplifier U3, and the cathode of the second diode D2 is connected to the non-inverting input end of the fourth operational amplifier U4; the inverting input end of the third operational amplifier U3 is grounded through a tenth resistor R10 on the one hand, and is connected to the output end of the third operational amplifier U3 through a ninth resistor R9 on the other hand; the inverting input terminal of the fourth operational amplifier U4 is grounded through a twelfth resistor R12 on the one hand, and is connected to the output terminal of the fourth operational amplifier U4 through an eleventh resistor R11 on the other hand; the third operational amplifier U3 outputs a voltage VT2 in a high temperature state, and the fourth operational amplifier U4 outputs a voltage VT3 in a low temperature state.
As a specific example, the calibration circuit includes a fifth operational amplifier U5, thirteenth to twenty-first resistors R13 to R21;
the voltage VT2 in a high temperature state and the voltage VT3 in a low temperature state output by the driving circuit are respectively connected into the non-inverting input end of the fifth operational amplifier U5 through a fifteenth resistor R15 and a sixteenth resistor R16;
the seventeenth resistor R17, the eighteenth resistor R18 and the nineteenth resistor R19 are connected to a common end, the voltage of the common end is the voltage VF2, the other end of the nineteenth resistor R19 is grounded, the other end of the eighteenth resistor R18 is connected with the reference voltage VR2, the other end of the seventeenth resistor R17 is connected with the non-inverting input end of the fifth operational amplifier U5, and the reference voltage VR2 is divided into a voltage-dividing network through the eighteenth resistor R18 and the nineteenth resistor R19 to obtain the adjustable voltage VF2;
the thirteenth resistor R13, the twentieth resistor R20 and the twenty-first resistor R21 are connected to a common end, the voltage of the common end is the voltage VF3, the other end of the twentieth resistor R20 is grounded, the other end of the twenty-first resistor R21 is connected with the reference voltage VR3, the other end of the thirteenth resistor R13 is connected to the inverting input end of the fifth operational amplifier U5, and the reference voltage VR3 is divided into a voltage division network through the twentieth resistor R20 and the twenty-first resistor R21 to obtain the adjustable voltage VF3; the reverse input end of the fifth operational amplifier U5 is connected with the output end through a fourteenth resistor R14;
by adjusting the voltage dividing network, the temperature compensation voltage VT output by the fifth operational amplifier U5 is corrected to zero and is taken as a final output.
As a specific example, the temperature sensor S1 is of the type TMP36, the output voltage of the temperature sensor S1 at the normal temperature of 25 ℃ is 750mV, the voltage division network formed by the first resistor R1 and the second resistor R2 divides the reference voltage VR1 of +5v to the voltage VD of 750mV, and the output voltage of the temperature sensor S1 is subtracted from the voltage VD, so that the temperature compensation voltage is corrected to be within ±10mV at the normal temperature of 25 ℃, thereby realizing normal temperature correction and zero-returning.
As a specific example, in the split driving circuit, when the temperature is higher than 25 ℃, the voltage VT1S is positive and is output to the fourth operational amplifier U4 through the second diode D2; when the temperature is lower than 25 ℃, the voltage VT1S is negative and is output to the third operational amplifier U3 through the first diode D1; the third operational amplifier U3 and the fourth operational amplifier U4 respectively adjust the amplification factors so that the voltage VT2 in the high temperature state and the voltage VT3 in the low temperature state which are separately output through the diode have different temperature slopes, and output the different temperature slopes to the calibration circuit.
As a specific example, in the temperature sensing circuit, the input signal of the first operational amplifier U1 is reversely connected, that is, the output of the temperature sensor S1 is connected to the inverting input end of the first operational amplifier U1, and the reference voltage VR1 is connected to the non-inverting input end of the first operational amplifier U1, so that the inversion of the temperature slope can be realized, and the temperature sensing circuit is used for temperature compensation of a reverse temperature drift system.
The invention will be further described with reference to the drawings and specific examples.
Examples
Referring to fig. 1, the separation compensation temperature control device of the present invention includes a temperature sensing circuit, a separation driving circuit, and a calibration circuit. The main indicators describing this technology are: 1) Compensating voltage peak-to-peak value: 120mV; 2) Typical temperature slope: 15 mV/DEG C (the high and low temperatures can be respectively adjusted); 3) The compensation range is 2.5V; 4) Working temperature range: -40 to +85 ℃; 5) Dimensions (length) 25mm x (width) 15mm x (height) 5mm.
Referring to fig. 1 and table 1, the temperature sensing circuit part includes a temperature sensor S1, a double pole double throw switch U6, a first operational amplifier U1, and peripheral first to sixth resistors R1 to R6.
The temperature information is firstly converted into voltage information through a temperature sensor S1 (TMP 36), wherein the temperature sensor TMP36 is a high-precision temperature sensor, and the temperature measurement precision is within +/-2 ℃; the working temperature range can reach minus 40 ℃ to +125 ℃, and the temperature gradient is positive, namely the output voltage of the circuit increases along with the temperature increase, so that the high precision and the wide temperature characteristic of the whole circuit can be ensured. The output voltage at room temperature 25℃was 750mV.
Referring to fig. 1 and table 1, the voltage VD divides the +5v reference voltage VR1 to 750mV through a voltage dividing network composed of a first resistor R1 and a second resistor R2, which is equal to the output voltage of the TMP36 at 25 ℃. The first operational amplifier U1 is a precision rail-to-rail low-noise operational amplifier OP184, the U1 achieves the function of a subtracting circuit, the output voltage of the TMP36 is subtracted from the reference voltage VD, the temperature compensation voltage is corrected to be within +/-10 mV at the normal temperature of 25 ℃, normal temperature correction return to zero is achieved, the low-temperature voltage is smaller than 0V, and the high-temperature voltage is larger than 0V.
Referring to fig. 1 and table 1, the split driving circuit includes second, third and fourth operational amplifiers U2, U3 and U4, first and second diodes D1 and D2, and peripheral seventh to twelfth resistors R7 to R12. The second, third and fourth operational amplifiers U2, U3 and U4 are OP484 and are precision rail-to-rail low noise operational amplifiers. The first diode D1 and the second diode D2 are diodes 1N60P. Since the upper stage temperature sensing circuit has corrected the output voltage of 25 ℃ to about 0V, the split driving circuit first performs driving amplification on the input voltage to obtain the amplified voltage VT1S. The output of the second operational amplifier U2 is connected with the first diode D1 and the second diode D2 which are opposite in direction, and the unidirectional conduction characteristic of the diodes is utilized, and the high-low temperature separation output of the compensation voltage is realized by using the two first diodes D1 and the second diodes D2 which are opposite in direction. Specifically, when the temperature is higher than 25 ℃, VT1S is a positive voltage, which can be output to the next-stage fourth operational amplifier U4 through the second diode D2; when the temperature is lower than 25 ℃, VT1S is a negative voltage, which can be output to the next-stage third operational amplifier U3 through the first diode D1. The third operational amplifier U3 and the fourth operational amplifier U4 may respectively adjust amplification factors such that the voltage VT2 in the high temperature state and the voltage VT3 in the low temperature state, which are separately output through the diode, have different temperature slopes and are output to the next stage circuit.
Referring to fig. 1 and table 1, the correction circuit is composed of a first-stage fifth operational amplifier U5 and a plurality of peripheral resistors, and the correction circuit can perform addition synthesis on the voltage VT2 in the high temperature state and the voltage VT3 in the low temperature state, and respectively forward and backward add with the voltage VF2 in the high temperature state and the voltage VF3 in the low temperature state. The reference voltage VR2 obtains adjustable voltage VF2 through a voltage division network formed by an eighteenth resistor R18 and a nineteenth resistor R19; the reference voltage VR3 obtains an adjustable voltage VF3 through a voltage division network formed by a twenty-first resistor R20 and a twenty-first resistor R21; and by adjusting the voltage division network, the temperature compensation voltage VT is corrected and zeroed at 25 ℃ and is used as final output. Specifically, the voltage VT is about 0V at 25 ℃, higher than 0V at a high temperature, and lower than 0V at a low temperature.
TABLE 1 list of components and their component values
Referring to fig. 1 and table 1, in the temperature sensing circuit portion, the input signal of the first operational amplifier U1 is reversely connected (i.e., the input of the TMP36 is connected to the inverting input terminal of the first operational amplifier U1, and the reference voltage VR1 is connected to the non-inverting input terminal), so that the temperature slope can be reversely rotated to adapt to the temperature compensation of the reverse temperature drift system.
From the above, the whole circuit is powered by a single power supply +5V, a negative power supply is not needed, and the circuit is convenient to use. The adjusting part of the circuit is realized by adjusting the chip resistor, and the circuit is simple and reliable. The whole circuit is realized by using only 6 discrete components, the circuit size is small, and the temperature control function integration and the transplantation are easy to realize in different circuit systems.
Claims (7)
1. The utility model provides a separation compensation temperature control device which characterized in that includes temperature sensing circuit, separation drive circuit and calibration circuit, wherein:
the temperature sensing circuit adopts a temperature sensor to measure the external temperature change, converts the temperature change into the voltage signal change, and adjusts the temperature compensation zero point through a subtraction circuit;
the separation driving circuit receives the voltage signal output by the temperature sensing circuit, drives and amplifies the voltage signal, and the amplified voltage signal is respectively connected to two diodes with opposite directions to separate and output the voltage in a high-temperature state and a low-temperature state;
the calibration circuit receives the voltages in the high-temperature state and the low-temperature state output by the separation driving circuit, and adds and synthesizes the voltages, wherein the added and synthesized voltage is added with the adjustable voltage output by one voltage division network in the forward direction and added with the adjustable voltage output by the other voltage division network in the reverse direction; and (3) performing normal-temperature zeroing correction by adjusting the partial pressure network.
2. The separation compensation temperature control device according to claim 1, wherein the temperature sensing circuit comprises a temperature sensor (S1), a double pole double throw switch (U6), a first operational amplifier (U1), and first to sixth resistors (R1 to R6);
the temperature sensor (S1) converts temperature information into voltage VT0 and outputs the voltage VT0, the output end is grounded through a fifth resistor (R5) and a sixth resistor (R6) in sequence, and the common end of the fifth resistor (R5) and the sixth resistor (R6) is connected to the non-inverting input end of the first operational amplifier (U1) through a double-pole double-throw switch (U6);
the first resistor (R1), the second resistor (R2) and the third resistor (R3) are connected to a common end, the voltage of the common end is voltage VD, the other end of the first resistor (R1) is connected with reference voltage VR1, the other end of the second resistor (R2) is connected with ground GND, the other end of the third resistor (R3) is connected with an inverting input end of the first operational amplifier (U1) through a double-pole double-throw switch (U6) on one hand, and is connected with an output end of the first operational amplifier (U1) through a fourth resistor (R4) on the other hand, and the first operational amplifier (U1) outputs voltage VT1.
3. The separation compensation temperature control device according to claim 1, wherein the separation driving circuit includes second to fourth operational amplifiers (U2 to U4), first to second diodes (D1, D2), and seventh to twelfth resistors (R7 to R12);
the voltage VT1 output by the temperature sensing circuit is connected to the non-inverting input end of the second operational amplifier (U2), and the inverting input end of the second operational amplifier (U2) is grounded through a seventh resistor (R7) on one hand and connected to the output end of the second operational amplifier (U2) through an eighth resistor (R8) on the other hand; the voltage VT1S output by the second operational amplifier (U2) is respectively connected to the cathode of the first diode (D1) and the anode of the second diode (D2), the anode of the first diode (D1) is connected to the non-inverting input end of the third operational amplifier (U3), and the cathode of the second diode (D2) is connected to the non-inverting input end of the fourth operational amplifier (U4); the inverting input of the third operational amplifier (U3) is grounded through a tenth resistor (R10) on the one hand, and is connected to the output of the third operational amplifier (U3) through a ninth resistor (R9) on the other hand; the inverting input of the fourth operational amplifier (U4) is connected to ground via a twelfth resistor (R12) on the one hand and to the output of the fourth operational amplifier (U4) via an eleventh resistor (R11) on the other hand; the third operational amplifier (U3) outputs a voltage VT2 in a high temperature state, and the fourth operational amplifier (U4) outputs a voltage VT3 in a low temperature state.
4. The separation compensation temperature control device according to claim 1, wherein the calibration circuit comprises a fifth operational amplifier (U5), thirteenth to twenty-first resistors (R13 to R21);
the voltage VT2 in a high temperature state and the voltage VT3 in a low temperature state output by the driving circuit are respectively connected into the non-inverting input end of the fifth operational amplifier (U5) through a fifteenth resistor (R15) and a sixteenth resistor (R16);
the seventeenth resistor (R17), the eighteenth resistor (R18) and the nineteenth resistor (R19) are connected to a common end, the voltage of the common end is the voltage VF2, the other end of the nineteenth resistor (R19) is grounded, the other end of the eighteenth resistor (R18) is connected with the reference voltage VR2, the other end of the seventeenth resistor (R17) is connected with the non-inverting input end of the fifth operational amplifier (U5), and the reference voltage VR2 obtains the adjustable voltage VF2 through a voltage division network formed by the eighteenth resistor (R18) and the nineteenth resistor (R19);
the thirteenth resistor (R13), the twentieth resistor (R20) and the twenty-first resistor (R21) are connected to a common end, the voltage of the common end is the voltage VF3, the other end of the twentieth resistor (R20) is grounded, the other end of the twenty-first resistor (R21) is connected with the reference voltage VR3, the other end of the thirteenth resistor (R13) is connected with the inverting input end of the fifth operational amplifier (U5), and the reference voltage VR3 obtains the adjustable voltage VF3 through a voltage division network formed by the twentieth resistor (R20) and the twenty-first resistor (R21); the reverse input end of the fifth operational amplifier (U5) is connected with the output end through a fourteenth resistor (R14);
by adjusting the voltage dividing network, the temperature compensation voltage VT output by the fifth operational amplifier (U5) is corrected to zero and is taken as a final output.
5. The separation compensation temperature control device according to claim 2, wherein the temperature sensor (S1) is of a type of TMP36, the output voltage of the temperature sensor (S1) at the normal temperature of 25 ℃ is 750mV, the voltage division network consisting of the first resistor (R1) and the second resistor (R2) divides the reference voltage VR1 of +5v to the voltage VD of 750mV, and the output voltage of the temperature sensor (S1) is subtracted from the voltage VD, so that the temperature compensation voltage is corrected to within +/-10 mV at the normal temperature of 25 ℃, thereby realizing normal temperature correction and zero setting.
6. A separation compensation temperature control device according to claim 3, wherein in the separation driving circuit, when the temperature is higher than 25 ℃, the voltage VT1S is positive and is outputted to the fourth operational amplifier (U4) through the second diode (D2); when the temperature is lower than 25 ℃, the voltage VT1S is negative and is output to the third operational amplifier (U3) through the first diode (D1); the third operational amplifier (U3) and the fourth operational amplifier (U4) respectively adjust the amplification factors, so that the voltage VT2 in the high-temperature state and the voltage VT3 in the low-temperature state which are separately output through the diode have different temperature slopes and are output to the calibration circuit.
7. The separation compensation temperature control device according to claim 2, wherein in the temperature sensing circuit, the input signal of the first operational amplifier (U1) is reversely connected, that is, the output of the temperature sensor (S1) is connected to the inverting input end of the first operational amplifier (U1), and the reference voltage VR1 is connected to the non-inverting input end of the first operational amplifier (U1), so that the inversion of the temperature slope can be realized for the temperature compensation of the reverse temperature drift system.
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